The invention discloses a wireless local area network safety communication method, a wireless local area network safety communication system and an authentication server. The wireless local area network safety communication method comprises the following steps that: an authentication node sends an extensible authentication protocol starting message based on a local area network to a wireless access point; the authentication node receives an extensible authentication protocol authentication request message. And the authentication node sends an extensible authentication protocol authentication response message. The authentication node receives the first encrypted information. And the authentication node decrypts the first encrypted information of the authentication server by adopting the second public key of the authentication server based on the SM2 cryptographic algorithm. And the authentication node receives the second encrypted information and decrypts the second encrypted information of the authentication server by adopting a second public key of the authentication server. And when the authentication node receives the third message, the authentication node stores the third PMK key information. According to the wireless local area network secure communication method and system and the authentication server, the communication security can be improved.